Solve by elimination
x+2y=-7
x-5y=7

Answers

Answer 1
Answer: \left \{ {{x+2y=-7} \atop {x-5y=7\ \ | multiply\ by\ -1}} \right. \n\n \left \{ {{x+2y=-7} \atop {-x+5y=-7}} \right. \n+-----\n addition\ method\n\n 7y=-14 \ \ \ | divide\ by\ 7\n\n y=-2\n\n substitute\ y=-2\ to\ first\ equation\n\nx=-7-2y=-7+4=-3\n\nx=-3
Answer 2
Answer: \left\{\begin{array}{ccc}x+2y=-7\nx-5y=7&|multiply\ both\ sides\ by\ (-1)\end{array}\right\n\underline{+\left\{\begin{array}{ccc}x+2y=-7\n-x+5y=-7\end{array}\right}\ \ \ \ |add\ both\ sides\ of the\ equations\n.\ \ \ \ \ \ \ \ 7y=-14\ \ \ \ |divide\ both\ sides\ by\ 7\n.\ \ \ \ \ \ \ \ \boxed{y=-2}\n\nput\ the\ value\ of\

Related Questions

To which rational number subset(s) does the following number belong? 4/13 I. Rational Numbers II. Natural Numbers III. Whole Numbers IV. Integers
What are the rational and irrational number give examples!
How do I set this up
Plz help me!!! i will only mark brainlylest 4 a true answer!!!!
What is 4/9 in to a percent

A baseball player won 80% of the games he pitched. if he pitched 35 ballgames, how many games did he win?

Answers

80% of 35 is what?
1. Multiply the opposites80 x 35 = 2800
2. Divide by the remaining number.
100√2800 =28
28 games.

√= i used this to make division bar thing
Multiply 35 by 80 and divide by 100 and get an answer of 28.

John is trying to determine the length of the staircase he will need for a deck that is 12 feet high he wants to start the stairs 21 feet from the deck

Answers

right triangle
legs are 21 and 12

a^2+b^2=c^2
12^2+21^2=c^2
144+441=c^2
585=c^2
sqrt both sides
5√65=c
aprox
24.1868=c

about 24.2 feet

A black tailed Jackrabbit hops about 7 feet in a single hop how far can it hop in 5 seconds

Answers

how many hops can it do in one second= ?
         7x5x?

the amount of water in a bottle is reduced by 85% to 120 milliters how many water was originally in the bottle.

Answers

Given:
Rate of reduction : 85%
Remaining volume: 120 ml.

This means that 120 ml is equivalent to 15% of the original volume.

100% - 85% = 15%

120 ml ÷ 15% = 800 ml.

There was 800 ml of water before it was reduced.

800 ml * 85% = 680 ml ⇒ volume reduced
800 ml - 680 ml = 120 ml ⇒ volume left after reduction.

7/8*cforc=8
how you solve that

Answers

Answer:

7

Step-by-step explanation:

(7/8)(8)=7

What number is 70% of 200

Answers

70% = 0.7
0.7 of 200 = 0.7*200
                 = 140
So, 70% of 200 is 140
it's 140

200/x=100/70
(200/x)*x=(100/70)*x       - we multiply both sides of the equation by x
200=1.42857142857*x       - we divide both sides of the equation by (1.42857142857) to get x
200/1.42857142857=x 
140=x 
x=140